import { Observable } from '../Observable';
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import { ObservableInput } from '../types';
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import { from } from './from';
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import { isArray } from '../util/isArray';
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import { EMPTY } from './empty';
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/* tslint:disable:max-line-length */
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export function onErrorResumeNext<R>(v: ObservableInput<R>): Observable<R>;
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export function onErrorResumeNext<T2, T3, R>(v2: ObservableInput<T2>, v3: ObservableInput<T3>): Observable<R>;
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export function onErrorResumeNext<T2, T3, T4, R>(v2: ObservableInput<T2>, v3: ObservableInput<T3>, v4: ObservableInput<T4>): Observable<R>;
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export function onErrorResumeNext<T2, T3, T4, T5, R>(v2: ObservableInput<T2>, v3: ObservableInput<T3>, v4: ObservableInput<T4>, v5: ObservableInput<T5>): Observable<R>;
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export function onErrorResumeNext<T2, T3, T4, T5, T6, R>(v2: ObservableInput<T2>, v3: ObservableInput<T3>, v4: ObservableInput<T4>, v5: ObservableInput<T5>, v6: ObservableInput<T6>): Observable<R>;
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export function onErrorResumeNext<R>(...observables: Array<ObservableInput<any> | ((...values: Array<any>) => R)>): Observable<R>;
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export function onErrorResumeNext<R>(array: ObservableInput<any>[]): Observable<R>;
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/* tslint:enable:max-line-length */
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/**
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* When any of the provided Observable emits an complete or error notification, it immediately subscribes to the next one
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* that was passed.
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*
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* <span class="informal">Execute series of Observables no matter what, even if it means swallowing errors.</span>
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*
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* 
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*
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* `onErrorResumeNext` Will subscribe to each observable source it is provided, in order.
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* If the source it's subscribed to emits an error or completes, it will move to the next source
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* without error.
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*
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* If `onErrorResumeNext` is provided no arguments, or a single, empty array, it will return {@link index/EMPTY}.
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*
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* `onErrorResumeNext` is basically {@link concat}, only it will continue, even if one of its
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* sources emits an error.
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*
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* Note that there is no way to handle any errors thrown by sources via the result of
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* `onErrorResumeNext`. If you want to handle errors thrown in any given source, you can
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* always use the {@link catchError} operator on them before passing them into `onErrorResumeNext`.
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*
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* ## Example
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* Subscribe to the next Observable after map fails</caption>
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* ```ts
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* import { onErrorResumeNext, of } from 'rxjs';
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* import { map } from 'rxjs/operators';
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*
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* onErrorResumeNext(
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* of(1, 2, 3, 0).pipe(
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* map(x => {
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* if (x === 0) throw Error();
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* return 10 / x;
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* })
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* ),
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* of(1, 2, 3),
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* )
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* .subscribe(
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* val => console.log(val),
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* err => console.log(err), // Will never be called.
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* () => console.log('done'),
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* );
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*
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* // Logs:
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* // 10
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* // 5
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* // 3.3333333333333335
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* // 1
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* // 2
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* // 3
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* // "done"
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* ```
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*
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* @see {@link concat}
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* @see {@link catchError}
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*
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* @param {...ObservableInput} sources Observables (or anything that *is* observable) passed either directly or as an array.
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* @return {Observable} An Observable that concatenates all sources, one after the other,
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* ignoring all errors, such that any error causes it to move on to the next source.
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*/
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export function onErrorResumeNext<T, R>(...sources: Array<ObservableInput<any> |
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Array<ObservableInput<any>> |
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((...values: Array<any>) => R)>): Observable<R> {
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if (sources.length === 0) {
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return EMPTY;
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}
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const [ first, ...remainder ] = sources;
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if (sources.length === 1 && isArray(first)) {
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return onErrorResumeNext(...first);
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}
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return new Observable(subscriber => {
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const subNext = () => subscriber.add(
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onErrorResumeNext(...remainder).subscribe(subscriber)
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);
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return from(first).subscribe({
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next(value) { subscriber.next(value); },
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error: subNext,
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complete: subNext,
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});
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});
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}
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